Charging control method, charging circuit topology, electronic device, and storage medium

Abstract

The application provides a charging control method, a charging circuit topology, an electronic device and a storage medium, wherein the charging control method comprises: acquiring the voltage of each battery module of a power battery, and acquiring the voltage of each battery monomer in each battery module; based on the voltage of each battery monomer, calculating the SOC of each battery monomer, and determining the maximum SOC of the power battery based on the SOC of each battery monomer; when the maximum SOC is greater than or equal to 90% and less than or equal to 98%, charging is performed by using a module equalization strategy; and when the maximum SOC is greater than or equal to 98% and less than or equal to 100%, charging is performed by using a monomer equalization strategy. By using the module equalization strategy charging and the module equalization strategy charging, the application can avoid the charging voltage imbalance caused by the battery difference, thereby avoiding the phenomenon that some individual battery monomers reach the maximum voltage while other batteries are not fully charged, thereby avoiding the phenomenon that the battery pack appears to be floating, and finally compared with the prior art, more power can be charged into the power battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power batteries, in particular to a charging control method, a charging circuit topology, an electronic device and a storage medium. BACKGROUND

[0002] At present, the power battery charging method in the prior art has the following disadvantages: first, the charging power of a single gun is limited, and often cannot reach the maximum current requested by the BMS, resulting in a long charging time; second, due to uneven single cell voltage, the battery will be floating charged. SUMMARY

[0003] The purpose of the embodiments of the present application is to provide a charging control method, a charging circuit topology, an electronic device and a storage medium, so as to avoid uneven charging voltage caused by battery difference, thereby avoiding some individual battery monomers reaching the maximum voltage while other batteries are not fully charged, thereby avoiding the phenomenon of floating charge of the battery pack. Ultimately, compared with the prior art, more power can be charged into the battery.

[0004] In a first aspect, the present application provides a charging control method, the method comprising:

[0005] obtaining the voltage of each battery module of a power battery, and obtaining the voltage of each battery monomer in each battery module;

[0006] based on the voltage of each battery monomer, calculating the SOC of each battery monomer, and determining the maximum SOC of the power battery based on the SOC of each battery monomer;

[0007] when the maximum SOC is greater than or equal to 90% and less than or equal to 98%, the module balancing strategy is adopted for charging, in which, based on the voltage of each battery module, all the battery modules are sorted in descending order of voltage to obtain a sorting queue, and based on the first charging gun, the battery modules in the sorting queue are sequentially charged from the battery module with the smallest voltage in the sorting queue. Whenever the voltage of the battery module being charged reaches the voltage of the battery module with the second smallest voltage in the sorting queue, the battery module being charged is connected in series with the battery module with the second smallest voltage in the sorting queue, until all the battery modules in the sorting queue are fully charged. When the battery module is fully charged, the power battery has a battery monomer with a SOC greater than or equal to 98%;

[0008] when the maximum SOC is greater than or equal to 98% and less than or equal to 100%, charging is performed using a single cell equalization strategy, in which all the battery cells in the power battery are classified based on voltage size, the classification manner is to take the maximum voltage Vmax and the minimum voltage Vmin of the battery as the boundaries of the interval, and classify according to the voltage difference of every 0.001V, so as to classify all the battery cells in the power battery into P=(Vmax-Vmin) / 0.001 intervals, and the first charging gun is controlled to sequentially charge the battery cells in each interval from the [Vmin, Vmin+0.001] interval in the order from small to large, until the voltage of all the battery cells reaches the maximum voltage Vmax of the battery, wherein the battery cells in the same interval are connected in parallel in the same battery module, and the battery cells of different battery modules are connected in series.

[0009] The present application can use different charging strategies at different stages of maximum SOC, wherein when the maximum SOC is greater than or equal to 90% and less than or equal to 98%, charging is performed using a module equalization strategy, and when the maximum SOC is greater than or equal to 98% and less than or equal to 100%, charging is performed using a single cell equalization strategy. Further, by using the module equalization strategy charging and the module equalization strategy charging, the charging voltage imbalance caused by battery difference can be avoided, thereby avoiding some individual battery cells reaching the maximum voltage while other battery cells are not fully charged, thereby avoiding the phenomenon of floating charge of the battery pack, and ultimately compared with the prior art, more power can be charged into the power battery.

[0010] In an optional embodiment, the method further comprises:

[0011] When the maximum SOC is less than 90%, the first charging gun and the second charging gun are controlled to output current according to maximum capacity to charge the power battery.

[0012] The optional embodiment can control the first charging gun and the second charging gun to output current according to maximum capacity to charge the power battery when the maximum SOC is less than 90%, thereby enabling the double guns to charge the power battery, thereby fully exerting the capacity of the two charging guns, improving the charging efficiency of the battery pack, and shortening the charging time.

[0013] In an optional embodiment, based on the first charging gun and the second charging gun outputting current according to maximum capacity to charge the power battery, comprising:

[0014] The first charging gun is controlled to output current according to maximum capacity to charge m battery modules in the power battery, wherein the power battery has n battery modules, n and m are positive integers, and n is greater than m.

[0015] controlling the second charging gun to output current at maximum capacity to charge n-m battery modules in the power battery.

[0016] The optional embodiment can control the first charging gun to output current at maximum capacity to charge m battery modules in the power battery, and control the second charging gun to output current at maximum capacity to charge n-m battery modules in the power battery.

[0017] In the optional embodiment, the n-m battery modules charged by the second charging gun are divided into first-type battery modules and second-type battery modules, and the first-type battery modules are connected in parallel with the second-type battery modules.

[0018] The optional embodiment can divide the n-m battery modules into first-type battery modules and second-type battery modules, and the first-type battery modules are connected in parallel with the second-type battery modules, so as to control the first-type battery modules and the second-type battery modules separately.

[0019] In the optional embodiment, the method further comprises:

[0020] monitoring the voltage of the second-type battery modules, and bypassing the second-type battery modules to stop charging the second-type battery modules when a battery cell with SOC>90% appears in the second-type battery modules.

[0021] The optional embodiment can monitor the voltage of the second-type battery modules, and bypass the second-type battery modules to automatically stop charging the second-type battery modules when a battery cell with SOC>90% appears in the second-type battery modules.

[0022] In the optional embodiment, wherein, represents the maximum allowable charging current of the battery cell, C1 represents the maximum capacity output current of the first charging gun, I ch1 represents the maximum capacity output current of the second charging gun, I ch2 represents the maximum capacity output current of the second charging gun, and t represents the number of battery cells in a single battery module.

[0023] The optional embodiment can accurately calculate the number of modules that need to be charged by the first charging gun and the number of modules that need to be charged by the second charging gun according to the maximum capacity output current of the first charging gun and the maximum capacity output current of the second charging gun, and the number of battery cells in a single battery module.

[0024] In an optional embodiment, the number of the first type of battery modules is The number of the second type of battery modules is

[0025] In a second aspect, the present application provides a charging circuit topology, the charging circuit topology comprising a first charging connection device, a second charging connection device, a battery management system, a first sensor, a second sensor and a power battery pack.

[0026] The battery management system is connected with the first charging connection device and the second charging connection device, the first charging connection device is used for connecting with a first charging gun, and the second charging connection device is used for connecting with a second charging gun.

[0027] Each battery module in the power battery pack is connected with a battery module switch, the battery management system is connected with the battery module switch, each battery cell in the battery module is connected with a battery cell switch, and the battery management system is connected with the battery cell switch.

[0028] The first sensor is used for detecting the voltage and current of the battery module, the second sensor is used for detecting the voltage and current of the battery cell, and the battery management system is connected with the first sensor and the second sensor.

[0029] In addition, the battery management system is used for executing the charging control method according to any one of the preceding embodiments, and is used for sending a control signal to the battery module switch and the battery cell switch, so that the connection structure between the battery modules and the connection structure between the battery cells can be used to execute the charging control method according to any one of the preceding embodiments through the control signal.

[0030] The charging circuit topology of the present application can make the battery management system recombine the connection structure between the battery modules and the connection structure between the battery cells when executing the charging control method.

[0031] In a third aspect, the present application provides an electronic device, which is applied to a battery management system, and the electronic device comprises:

[0032] a processor; and

[0033] a memory configured to store machine-readable instructions, which, when executed by the processor, execute the charging control method according to any one of the preceding embodiments.

[0034] The electronic device of the present application can adopt different charging strategies at different stages of maximum SOC by executing the charging control method. When the maximum SOC is greater than or equal to 90% and less than or equal to 98%, a module balancing strategy is adopted for charging. When the maximum SOC is greater than or equal to 98% and less than or equal to 100%, a single cell balancing strategy is adopted for charging. Further, by adopting the module balancing strategy for charging and the module balancing strategy for charging, the charging voltage imbalance caused by the difference between the batteries can be avoided, thereby avoiding the phenomenon that some individual battery cells reach the maximum voltage while other batteries are not fully charged, thereby avoiding the phenomenon of floating charge of the battery pack. Ultimately, compared with the prior art, more power can be charged into the battery.

[0035] In a fourth aspect, the present application provides a storage medium, which stores a computer program, and the computer program is executed by a processor to perform the charging control method of any one of the preceding embodiments.

[0036] The storage medium of the present application can adopt different charging strategies at different stages of maximum SOC by executing the charging control method. When the maximum SOC is greater than or equal to 90% and less than or equal to 98%, a module balancing strategy is adopted for charging. When the maximum SOC is greater than or equal to 98% and less than or equal to 100%, a single cell balancing strategy is adopted for charging. Further, by adopting the module balancing strategy for charging and the module balancing strategy for charging, the charging voltage imbalance caused by the difference between the batteries can be avoided, thereby avoiding the phenomenon that some individual battery cells reach the maximum voltage while other batteries are not fully charged, thereby avoiding the phenomenon of floating charge of the battery pack. Ultimately, compared with the prior art, more power can be charged into the battery. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0038] Figure 1 is a flowchart of a charging control method disclosed by an embodiment of the present application;

[0039] Figure 2 is a charging circuit topology disclosed by an embodiment of the present application;

[0040] Figure 3 is a connection structure diagram of four battery cells that can be realized by an embodiment of the present application;

[0041] Figure 4is a connection structure diagram that can be realized by a battery module according to an embodiment of the present application.

[0042] Figure 5 is a structure diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

[0044] Embodiment One

[0045] Please refer to Figure 1 , Figure 1 is a flow diagram of a charging control method according to an embodiment of the present application, as shown in the figure, the method according to the embodiment of the present application includes the following steps: Figure 1

[0046] 101, acquiring the voltage of each battery module of the power battery, and acquiring the voltage of each battery cell in each battery module;

[0047] 102, calculating the SOC of each battery cell based on the voltage of each battery cell, and determining the maximum SOC of the power battery based on the SOC of each battery cell;

[0048] 103, when the maximum SOC is greater than or equal to 90% and less than or equal to 98%, charging is performed by using a module equalization strategy, in the module equalization strategy, based on the voltage of each battery module, all battery modules are sorted in the order of voltage from large to small to obtain a sorted queue, and based on the first charging gun, the battery module with the smallest voltage in the sorted queue is started, and the battery modules in the sorted queue are sequentially charged, whenever the voltage of the battery module being charged reaches the voltage of the battery module with the second smallest voltage in the sorted queue, the battery module being charged is connected in series with the battery module with the second smallest voltage in the sorted queue, until all battery modules in the sorted queue are charged, when the battery modules are charged, the power battery appears a battery cell with a SOC greater than or equal to 98%;

[0049] ​104、when the maximum SOC is greater than or equal to 98% and less than or equal to 100%, the power battery is charged by using the single cell equalization strategy, in the single cell equalization strategy, all battery cells in the power battery are classified based on the voltage size, the classification manner is that the maximum voltage Vmax of the battery and the minimum voltage Vmin of the battery are taken as the boundaries of the interval, and the battery cells are classified according to the voltage difference of every 0.001V, so as to classify all battery cells in the power battery into P=(Vmax-Vmin) / 0.001 intervals, the battery cells in each interval are sequentially charged from the [Vmin, Vmin+0.001] interval in the order from small to large based on the first charging gun, and the voltage of all battery cells reaches the maximum voltage Vmax of the battery, wherein, in the same interval, the battery cells in the same battery module are connected in parallel, and the battery cells of different battery modules are connected in series.

[0050] The embodiment of the present application can use different charging strategies at different stages of the maximum SOC, wherein, when the maximum SOC is greater than or equal to 90% and less than or equal to 98%, the power battery is charged by using the module equalization strategy, and when the maximum SOC is greater than or equal to 98% and less than or equal to 100%, the power battery is charged by using the single cell equalization strategy. Further, by using the module equalization strategy charging and the module equalization strategy charging, the charging voltage imbalance caused by the difference between the battery can be avoided, and then the phenomenon that part of the individual battery cells reaches the maximum voltage while the other battery cells are not fully charged can be avoided, and then the phenomenon that the battery pack appears floating charging can be avoided, and finally compared with the prior art, more power can be charged into the power battery.

[0051] In the embodiment of the present application, the power battery includes a plurality of battery modules, for example, 8 battery modules, and the battery module includes a plurality of battery cells, for example, one battery module includes 8 battery cells. It should be noted that the number of battery modules in the power battery and the number of battery cells in the battery module are not limited in the embodiment of the present application.

[0052] In the embodiment of the present application, after the voltage of the battery cell is obtained, the voltage of the battery cell can be processed based on the open circuit voltage drop method, so as to calculate the SOC of the battery cell. Further, when the SOC of all battery cells is obtained, the maximum SOC can be determined as the maximum SOC.

[0053] In the embodiment of the present application, all battery modules are sorted in the order from large to small according to the voltage, and a sorting queue can be obtained, for example, for the battery modules with voltages of 1V, 6V and 10V, the sorting queue obtained is [1V, 6V, 10V].

[0054] In the embodiments of the present application, when the voltage of the battery module currently being charged reaches the voltage of the battery module with the second smallest voltage in the sorting queue, the battery module currently being charged and the battery module with the second smallest voltage in the sorting queue are connected in series. As an example, assuming that there are three battery modules, and the corresponding sorting queue is [1V, 6V, 10V], at this time, the battery module with the voltage of 1V is charged first, until the voltage of the battery module changes to 6V, and the battery module is connected with the battery module with the voltage of 6V. At this time, it is equivalent to connecting the battery module with the voltage of 1V with the battery module with the second smallest voltage in the queue [1V, 6V, 10V], that is, the battery module with the voltage of 6V, when the battery module with the voltage of 1V is charged to 6V.

[0055] In an optional embodiment, the method of the embodiments of the present application further comprises the following steps:

[0056] When the maximum SOC is less than 90%, the first charging gun and the second charging gun output current according to the maximum capacity to charge the power battery.

[0057] The optional embodiment can output current according to the maximum capacity based on the first charging gun and the second charging gun to charge the power battery when the maximum SOC is less than 90%, thereby enabling the double-gun to charge the power battery, thereby fully exerting the capacity of the two charging guns, improving the charging efficiency of the battery pack, and shortening the charging time.

[0058] In an optional embodiment, the step of outputting current according to the maximum capacity based on the first charging gun and the second charging gun to charge the power battery comprises the following sub-steps:

[0059] The first charging gun outputs current according to the maximum capacity to charge m battery modules in the power battery, wherein the power battery has n battery modules, n and m are positive integers, and n is greater than m;

[0060] The second charging gun outputs current according to the maximum capacity to charge n-m battery modules in the power battery.

[0061] The optional embodiment can output current according to the maximum capacity based on the first charging gun to specifically charge m battery modules in the power battery, and output current according to the maximum capacity based on the second charging gun to specifically charge n-m battery modules in the power battery.

[0062] In an optional embodiment, the n-m battery modules charged by the second charging gun are divided into first-type battery modules and second-type battery modules, wherein the first-type battery modules and the second-type battery modules are connected in parallel.

[0063] The embodiment can divide the n-m battery modules into first-type battery modules and second-type battery modules, and the first-type battery modules are connected in parallel with the second-type battery modules to control the first-type battery modules and the second-type battery modules separately.

[0064] In an optional embodiment, the method of the embodiment further comprises the following steps:

[0065] The voltage of the second-type battery modules is monitored, and when the second-type battery modules have a battery cell with SOC>90%, the second-type battery modules are bypassed to stop charging the second-type battery modules.

[0066] The optional embodiment can monitor the voltage of the second-type battery modules, and when the second-type battery modules have a battery cell with SOC>90%, the second-type battery modules are bypassed to automatically stop charging the second-type battery modules.

[0067] In an optional embodiment, wherein, represents the maximum allowable charging current of the battery cell, C1 represents the maximum capacity output current of the first charging gun, I ch1 represents the maximum capacity output current of the second charging gun, I ch2 represents the maximum capacity output current of the second charging gun, t represents the number of battery cells in a single battery module.

[0068] The optional embodiment can accurately calculate the number of modules that need to be charged by the first charging gun and the number of modules that need to be charged by the second charging gun according to the maximum capacity output current of the first charging gun and the maximum capacity output current of the second charging gun, and the number of battery cells in a single battery module.

[0069] In an optional embodiment, the number of first-type battery modules is The number of second-type battery modules is

[0070] Embodiment two

[0071] The embodiment provides a charging circuit topology, which comprises a first charging connection device, a second charging connection device, a battery management system, a first sensor, a second sensor, and a power battery pack.

[0072] The battery management system is connected with the first charging connection device and the second charging connection device, the first charging connection device is used for connecting with a first charging gun, and the second charging connection device is used for connecting with a second charging gun.

[0073] Each battery module in the power battery pack is connected with a battery module switch, the battery management system is connected with the battery module switch, each battery cell in the battery module is connected with a battery cell switch, and the battery management system is connected with the battery cell switch;

[0074] The first sensor is used to detect the voltage and current of the battery module, the second sensor is used to detect the voltage and current of the battery cell, and the battery management system is connected with the first sensor and the second sensor;

[0075] The battery management system is used to execute the charging control method according to any one of the foregoing embodiments, and is used to send a control signal to the battery module switch and the battery cell switch, so that the connection structure between the battery modules and the connection structure between the battery cells can be used to execute the charging control method according to any one of the foregoing embodiments through the control signal.

[0076] In the embodiments of the present application, specifically, referring to FIG. 2, Figure 2 is a charging circuit topology structure disclosed by the embodiments of the present application. As shown in the figure, Figure 2 the charging circuit topology structure includes charging connection device 1 and charging connection device 2, that is, first charging connection device and second charging connection device, wherein the first charging connection device and the first charging connection device each include a main positive relay, a pre-charging relay, a fast-charging relay, and a fast-charging port, and the fast-charging port is used to be connected with a first charging gun and a second charging gun.

[0077] In the embodiments of the present application, the battery management system can change the connection structure between the battery cells by sending a control signal to the battery cell switch, wherein, taking B1, B2, B3, and B4 as an example, the connection structure that can be achieved is as shown in FIG. 3, Figure 3 Figure 3 is a connection structure diagram of four battery cells that can be achieved by the embodiments of the present application.

[0078] In the embodiments of the present application, the battery management system can change the connection structure between the battery cells by sending a control signal to the battery cell switch, wherein, taking M1, M2, M3, and M4 as an example, the connection structure that can be achieved is as shown in FIG. 4, Figure 4 Figure 4 is a connection structure diagram of four battery modules that can be achieved by the embodiments of the present application.

[0079] In the embodiments of the present application, the battery management system can execute the charging control method at a frequency of once every 1s. Therefore, the charging circuit topology structure of the embodiments of the present application can make the battery management system recombine the connection structure between the battery modules and the connection structure between the battery cells when executing the charging control method.

[0080] ​​Embodiment Three

[0081] Please refer to Figure 5 , Figure 5 is a structural schematic diagram of an electronic device disclosed in an embodiment of the present application, wherein the electronic device is applied to a battery management system. As shown in Figure 5 , the electronic device of the present application comprises:

[0082] a processor 301; and

[0083] a memory 302 configured to store machine-readable instructions, the instructions being executed by the processor to perform the charge control method of any one of the preceding embodiments.

[0084] The electronic device of the present application can adopt different charging strategies at different stages of maximum SOC by performing the charge control method, wherein the module balancing strategy is adopted for charging when the maximum SOC is greater than or equal to 90% and less than or equal to 98%, and the single cell balancing strategy is adopted for charging when the maximum SOC is greater than or equal to 98% and less than or equal to 100%. Further, by adopting the module balancing strategy for charging and the module balancing strategy for charging, the charging voltage imbalance caused by the difference between the batteries can be avoided, thereby avoiding the phenomenon that some individual battery cells reach the maximum voltage while other batteries are not fully charged, thereby avoiding the phenomenon of floating charge of the battery pack. Ultimately, compared with the prior art, more power can be charged into the power battery.

[0085] Embodiment Four

[0086] The present application provides a storage medium, the storage medium stores a computer program, the computer program is executed by the processor to perform the charge control method of any one of the preceding embodiments.

[0087] The storage medium of the present application can adopt different charging strategies at different stages of maximum SOC by performing the charge control method, wherein the module balancing strategy is adopted for charging when the maximum SOC is greater than or equal to 90% and less than or equal to 98%, and the single cell balancing strategy is adopted for charging when the maximum SOC is greater than or equal to 98% and less than or equal to 100%. Further, by adopting the module balancing strategy for charging and the module balancing strategy for charging, the charging voltage imbalance caused by the difference between the batteries can be avoided, thereby avoiding the phenomenon that some individual battery cells reach the maximum voltage while other batteries are not fully charged, thereby avoiding the phenomenon of floating charge of the battery pack. Ultimately, compared with the prior art, more power can be charged into the power battery.

[0088] In the embodiments of the present application, it should be understood that the disclosed apparatus and method can be implemented in other manners. The embodiments described above are merely exemplary, for example, the division of the units is only a logical function division, and there can be another division manner in actual implementation; for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0089] In addition, the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments of the present application.

[0090] In addition, the functional modules in the various embodiments of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0091] It should be noted that if the functions are realized in the form of software function modules and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the parts that make contributions to the prior art or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, and various other media that can store program codes.

[0092] In this document, the terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations.

[0093] The above merely provides an example of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A charge control method characterized by, The method comprises: acquiring the voltage of each battery module of the power battery, and acquiring the voltage of each battery cell in each battery module; based on the voltage of each battery cell, calculating the SOC of each battery cell, and determining the maximum SOC of the power battery based on the SOC of each battery cell; when the maximum SOC is greater than or equal to 90% and less than or equal to 98%, charging is performed using a module balancing strategy, in which, based on the voltage of each battery module, all the battery modules are sorted in descending order of voltage to obtain a sorted queue, and based on a first charging gun, the battery modules in the sorted queue are sequentially charged from the battery module with the smallest voltage in the sorted queue, and whenever the voltage of the battery module being currently charged reaches the voltage of the battery module with the second smallest voltage in the sorted queue, the battery module being currently charged is connected in series with the battery module with the second smallest voltage in the sorted queue, until all the battery modules in the sorted queue are fully charged, and at this time, the power battery has a battery cell with a SOC greater than or equal to 98%; when the maximum SOC is greater than 98% and less than or equal to 100%, charging is performed using a cell balancing strategy, in which, based on the voltage, all the battery cells in the power battery are classified, the classification is performed by taking the maximum battery voltage Vmax and the minimum battery voltage Vmin as the boundaries of the interval, and classifying according to the voltage difference of every 0.001 V, so as to classify all the battery cells in the power battery into P=(Vmax-Vmin) / 0.001 intervals, and the first charging gun is controlled to sequentially charge the battery cells in each interval in descending order, starting from the [Vmin, Vmin+0.001] interval, until the voltage of all the battery cells reaches the maximum battery voltage Vmax, wherein, within the same interval, the battery cells in the same battery module are connected in parallel, and the battery cells of different battery modules are connected in series.

2. The method of claim 1, wherein, The method further comprises: when the maximum SOC is less than 90%, controlling the first charging gun and the second charging gun to output current at maximum capacity to charge the power battery.

3. The method of claim 2, wherein, Based on the first charging gun and the second charging gun outputting current at maximum capacity to charge the power battery, comprising: controlling the first charging gun to output current at maximum capacity to charge m battery modules in the power battery, wherein the power battery has n battery modules, n and m are positive integers, and n is greater than m; controlling the second charging gun to output current at maximum capacity to charge n-m battery modules in the power battery.

4. The method of claim 3, wherein, The n-m battery modules charged by the second charging gun are divided into first-type battery modules and second-type battery modules, wherein the first-type battery modules and the second-type battery modules are connected in parallel.

5. The method of claim 4, wherein, The method further comprises: Monitor the voltage of the second type of battery module, and when the second type of battery module has a battery cell with SOC>90%, bypass the second type of battery module to stop charging the second type of battery module.

6. The method of claim 5, wherein, wherein, , , , i max represents the maximum allowed charging current of the battery cell, represents the maximum capable output current of the first charging gun, represents the maximum capable output current of the second charging gun, represents the number of battery cells in a single battery module.

7. The method of claim 6, wherein, The number of the first type of battery module is , and the number of the second type of battery module is .

8. A charging circuit topology, characterized by, The charging circuit topology includes a first charging connection device, a second charging connection device, a battery management system, a first sensor, a second sensor, and a power battery pack. The battery management system is connected with the first charging connection device and the second charging connection device, the first charging connection device is used to connect with a first charging gun, and the second charging connection device is used to connect with a second charging gun. Each battery module in the power battery pack is connected with a battery module switch, the battery management system is connected with the battery module switch, each battery cell in the battery module is connected with a battery cell switch, and the battery management system is connected with the battery cell switch. The first sensor is used to detect the voltage and current of the battery module, the second sensor is used to detect the voltage and current of the battery cell, and the battery management system is connected with the first sensor and the second sensor. The battery management system is used to execute the charging control method according to any one of claims 1-7, and is used to send a control signal to the battery module switch and the battery cell switch, so that the connection structure between the battery modules and the connection structure between the battery cells can be used to execute the charging control method according to any one of claims 1-7.

9. An electronic device, comprising: The electronic device is applied to a battery management system, and the electronic device includes: a processor; and a memory configured to store machine-readable instructions that, when executed by the processor, perform the charging control method according to any one of claims 1-7.

10. A storage medium, characterized by The storage medium stores a computer program, and the computer program is executed by the processor to perform the charging control method according to any one of claims 1-7.

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